Denon AVR-4308CI +/- Amp. Difference?

Bernal
Bernal Posts: 991
edited April 2009 in Speakers
1.- What a difference I have to use an amp with my Denon (AVR-4308Ci) and LSI series?:confused:
2.- This graph shows that the AVR-4308CI's left channel, from Multi input to speaker output with two channels driving 8-ohm loads, reached 0.1% distortion at 198.6 watts and 1% distortion at 218.9 watts. The distortion level remained at or below 0.002% across all power levels until it reached about 165 watts. Into 4 ohms, the amplifier reached 0.1% distortion at 298.0 watts and 1% distortion at 343.4 watts.

With five channels driven continuously into 8-ohm loads, the receiver reached 0.1% distortion at 144.8 watts and 1% distortion at 173.6 watts. With seven channels driven continuously into 8-ohm loads, it reached 0.1% distortion at 124.5 watts and 1% distortion at 150.3 watts.

1) DENON AVR-4308CI: Advanced 7.1 CH/5.1+2 CH/ 3.1+2+2 CH A/V Home Theater /MultiMedia Multi-Source/Zone Receiver with Networking and WiFi/170 watts x 7 channels
2) HITACHI P55T501. 55" HD1080 Plasma HDTV
3) DENON DVD-1740: Progressive Scan DVD Video/CD Player
4) DENON DVD-2500BTCI: Blu-ray Disc™ DVD/CD Digital Player/Transport
5) POLKAUDIO LSiC (Center speaker)
6) POLKAUDIO LSi15 LEFT (Front speaker)
7) POLKAUDIO LSi15 RIGHT (Front speaker)
8) POLKAUDIO LSif/x LEFT (Surround speaker)
9) POLKAUDIO LSif/x RIGHT (Surround speaker)
10) SONY SA-WP16 ( Sub Woofer 2X200W)
Post edited by Bernal on
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  • Bernal
    Bernal Posts: 991
    edited April 2009
    Manufactured description:

    Denon AVR-4308CI Home Theater Receiver with Network Streaming and Wi-Fi offers a power output of 140 watts per channel, but adds a number of engineering advancements to get the most out of the technology. One of the most significant 7-Channel Equal Power lets you connect seven speakers independently without connecting individual power amps via pre-outs. That’s because the AVR-4308CI comes with a built-in internal amplifier for each speaker in your collection. This makes it possible to do things like connect a second surround back speaker directly off the main amplifier to enjoy 7.1 surround formats. The receiver’s Dynamic Discrete Surround Circuit (DDSC), meanwhile, optimizes all elements of the surround processor through the use of discrete high-performance components, including separate analog-to-digital and digital-to-analog converters, with sophisticated DSP surround decoding.:cool:
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  • arnaudh
    arnaudh Posts: 17
    edited April 2009
    Well, seems though that you have the same issue that I might have with my Denon 2809CI and my LSis (for now I'm running the LSi9s off an old 2-channel amp). Your receiver (and mine) are not rated for 4 ohm speakers.

    From your manual:
    Audio section
    • Power amplifier
    Rated output: Front:
    140 W + 140 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05 % T.H.D.)
    170 W + 170 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)
    Center:
    140 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05 % T.H.D.)
    170 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)
    Surround (A + B):
    140 W + 140 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05 % T.H.D.)
    170 W + 170 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)
    Surround back:
    140 W + 140 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05 % T.H.D.)
    170 W + 170 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)
    Dynamic power: 150 W x 2ch (8 Ω/ohms)
    220 W x 2ch (4 Ω/ohms)
    Output connectors: Front, Center, Surround back 6 ~ 16 Ω/ohms
    Surround: A or B 6 ~ 16 Ω/ohms
    A + B 8 ~ 16 Ω/ohms
    __________________
    Front: SDA SRS3.1TLs
    Center: LSiC
    Rear: LSi9s
    Denon 2809CI
    Emotiva XPA-5
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  • devani
    devani Posts: 1,497
    edited April 2009
    that's true....

    the number tells you
    140 W + 140 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05 % T.H.D.)
    170 W + 170 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)

    at 6 ohms, your 20 ~20KHz power is would be much lower than 170W as listed with same T.H.D. as 8 ohms power rating.
    arnaudh wrote: »
    Well, seems though that you have the same issue that I might have with my Denon 2809CI and my LSis (for now I'm running the LSi9s off an old 2-channel amp). Your receiver (and mine) are not rated for 4 ohm speakers.

    From your manual:
    Video: LG 55LN5100/Samsung LNT4065F
    Receiver: HK AVR445
    Source: OPPO BDP-93
    HT: POLK SPEAKERS RTi6, FXi3, CSi5, VTF-3 MK2
    2Ch system: MC2105, AR-XA, AR-2A, AR9, BX-300, OPPO BDP-83
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  • Bernal
    Bernal Posts: 991
    edited April 2009
    The topic generates a lot of doubts? The contradictory information on the Internet. I want to be sure before investing in an amplifier.
    Other recommendations. Eg. amp, Thank you...    :confused:
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  • cnh
    cnh Posts: 13,284
    edited April 2009
    The distortion levels and power ratings for that Denon at 4 ohms are probably for ONE channel ONLY! There is no way that an AVR 4308 can handle a COMPLETE LSI surround system....where almost everything is a 4 ohm load. You have to have a power amp for that....or you'll overheat the receiver and maybe even damage the speakers at higher volumes. At lower volume you might be OK....but then what's the point if it's home theater sound you want?

    Almost 'no' AVR gives true ratings for powering 5 channels at 4 ohms RMS full range 20-20K! Only very high end receivers (and even some of them don't) or power amps provide such specs.

    Do yourself a favor and get at least a multi-channel power amp with at least 300 watts/channel at 4 ohms. The Denon can easily handle the pre/pro-amp duties.

    cnh
    Currently orbiting Bowie's Blackstar.!

    Polk Lsi-7s, Def Tech 8" sub, HK 3490, HK HD 990 (CDP/DAC), AKG Q701s
    [sig. changed on a monthly basis as I rotate in and out of my stash]
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